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(1 / 2)·(4·√4 + 4·√64)·( 4^2 + ( (√64 - √4) / 2 )^2 )^0.5 =
(1 / 2)·(4·√4 + 4·√64)·( 4^2 + ( (√64 - √4) / 2 )^2 )^0.5 =
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